Expand diagnosis eval fixtures

mvp/eval/README.md

@@ -7,6 +7,7 @@ This folder contains the first fixed-case evaluation set for the MVP diagnosis A
 - Case definitions: `cases/diagnosis-cases.json`
 - Offline trace fixtures: `fixtures/*.json`
 - Field definitions: `schema.md`
+- Baseline reports: `reports/baseline-report.json` and `reports/baseline-report.md`
 - Evaluator implementation: `DiagnosisTraceEvaluator`
 - Report writer: `DiagnosisEvalReportWriter`
 
@@ -22,6 +23,17 @@ Run the focused evaluator test:
 mvn -q "-Dtest=DiagnosisTraceEvaluatorTest" test
 ```
 
+The committed baseline report represents the current fixed fixture set:
+
+```text
+5 fixed cases
+5 passing fixture evaluations
+2 PASS verdicts
+3 LOW_CONFID verdicts
+```
+
+When fixtures or evaluator rules change, regenerate the report from the same case file and fixture directory, then update both JSON and Markdown outputs together.
+
 ## Interview Story
 
 The harness gives the MVP a repeatable baseline: